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I am not sure if I understand the issue correctly with sandbox. What exactly are you trying to do ? Are you trying to create a new user or generate token or are you trying to create a developer account and expecting the activation link which did not come through ?

The GetCategories api error is throwing the token error. Either the token is expired or may be you are using sandbox/production token to production/sandbox endpoint resp. If the token is expired, you need to renew the token by following these steps :https://ebaydts.com/eBayKBDetails?KBid=2018

If the token is still valid, please make sure if the token is for sandbox user, GetCategories api is being executed for sandbox endpoint.